Setessan Tactics is not the first card spoiled with the Strive ability so far, but it may be the best. It costs 1G to cast, and for each extra Green mana you add, you get to target an additional creature. For Heroic purposes, this is extremely relevant. Each of the target creatures get +1/+1 and gain a tap ability to fight another target creature until the end of turn. In Heroic decks, this is a very powerful ability, as most Heroic creatures will gain a +1/+1 counter upon being targeted and being able to tap to fight another creature can be quite handy, as well.
It’s a pretty simple combat trick, but it’s a very inexpensive way to trigger Heroic while getting a good deal of value, as well. It’s one of those cards that the later in the game that you play it, the better it will usually be. This card just made a good deal more Heroic cards playable.
~ Elspeth for the Win